Ada on ARM

Ada on ARM

[Frédéric PRACA]

Hi,
I'm currently trying to build an Ada cross compiler for ARM using the arm-rtems
target. I tried with GCC 4.0.2 and subversion-version but I failed.
What should I know to do this knowing that I already built the C and C++
cross-compilers ?

Thanks

Fred

Re: Ada on ARM

[Ralf Corsepius]

On Mon, 2005-11-21 at 17:14 +0100, Frédéric PRACA wrote:
> Hi,
> I'm currently trying to build an Ada cross compiler for ARM using the arm-rtems
> target. I tried with GCC 4.0.2 and subversion-version but I failed.
> What should I know to do this knowing that I already built the C and C++
> cross-compilers ?

1. Replace your host compiler with the same version you want to build
cross (Ada requirement).

2. The standard RTEMS toolchains are multilib'ed, Gnatlib in gcc-4.0.x
doesn't support multilibs 
=> The only chance you have is to build a non-multilib'ed custom
RTEMS-GCC.

3. GNAT from GCC < 4.0.2 did not support the arm. I haven't tried
gcc-4.0.2 and don't know if anybody has meanwhile added arm-support to
GNAT.

All in all, I think you've lost ... :(

Ralf

Re: Ada on ARM

[Joel Sherrill <joel@OARcorp.com>]

Ralf Corsepius wrote:
> On Mon, 2005-11-21 at 17:14 +0100, Frédéric PRACA wrote:
> 
>>Hi,
>>I'm currently trying to build an Ada cross compiler for ARM using the arm-rtems
>>target. I tried with GCC 4.0.2 and subversion-version but I failed.
>>What should I know to do this knowing that I already built the C and C++
>>cross-compilers ?
> 
> 
> 1. Replace your host compiler with the same version you want to build
> cross (Ada requirement).

Definitely critical to any success.

> 2. The standard RTEMS toolchains are multilib'ed, Gnatlib in gcc-4.0.x
> doesn't support multilibs 
> => The only chance you have is to build a non-multilib'ed custom
> RTEMS-GCC.

Instructions from Laurent Guerby are on the RTEMS Wiki.

http://www.rtems.com/wiki/index.php/RTEMSAda

> 3. GNAT from GCC < 4.0.2 did not support the arm. I haven't tried
> gcc-4.0.2 and don't know if anybody has meanwhile added arm-support to
> GNAT.

arm-rtems4.7 does build C, C++, and Ada on the gcc SVN head.  I have 
done no testing beyond that.

> All in all, I think you've lost ... :(

Even if you get a compiler from the head to compile, the gnat tools
seem to misparse target names with a version in them.  You would have to 
compile for arm-rtems to even have a prayer.


> Ralf

--joel

Re: Ada on ARM

[Frédéric PRACA]

Selon "Joel Sherrill <joel@OARcorp.com>" <joel.sherrill@OARcorp.com>:

> Ralf Corsepius wrote:
> > On Mon, 2005-11-21 at 17:14 +0100, Frédéric PRACA wrote:
> >
> >>Hi,
> >>I'm currently trying to build an Ada cross compiler for ARM using the
> arm-rtems
> >>target. I tried with GCC 4.0.2 and subversion-version but I failed.
> >>What should I know to do this knowing that I already built the C and C++
> >>cross-compilers ?
> >
> >
> > 1. Replace your host compiler with the same version you want to build
> > cross (Ada requirement).
>
> Definitely critical to any success.
Well, I tried to build a svn-version croos compiler with a 4.0.2 version of GCC.
Will try again tonight after building a whole svn GCC.

> > 2. The standard RTEMS toolchains are multilib'ed, Gnatlib in gcc-4.0.x
> > doesn't support multilibs
> > => The only chance you have is to build a non-multilib'ed custom
> > RTEMS-GCC.
>
> Instructions from Laurent Guerby are on the RTEMS Wiki.
>
> http://www.rtems.com/wiki/index.php/RTEMSAda
That's already my handbook ;-)

> > 3. GNAT from GCC < 4.0.2 did not support the arm. I haven't tried
> > gcc-4.0.2 and don't know if anybody has meanwhile added arm-support to
> > GNAT.
>
> arm-rtems4.7 does build C, C++, and Ada on the gcc SVN head.  I have
> done no testing beyond that.
If you managed, I hope I'll do too.

> > All in all, I think you've lost ... :(
>
> Even if you get a compiler from the head to compile, the gnat tools
> seem to misparse target names with a version in them.  You would have to
> compile for arm-rtems to even have a prayer.
I didn't want to compile with the release number anyway.
> --joel
Thanks again.

Fred

Re: Ada on ARM

[Laurent GUERBY]

On Mon, 2005-11-21 at 12:15 -0600, Joel Sherrill  wrote:
> arm-rtems4.7 does build C, C++, and Ada on the gcc SVN head.  I have 
> done no testing beyond that.

Is there a simulator for arm? Frederic do you have a testing
environment in mind? What "--enable-rtemsbsp=X" should I use?

I'm building up to GCC for arm-rtems4.7 right now.

Laurent

Re: Ada on ARM

[Frédéric PRACA]

Selon Laurent GUERBY <laurent@guerby.net>:

> On Mon, 2005-11-21 at 12:15 -0600, Joel Sherrill  wrote:
> > arm-rtems4.7 does build C, C++, and Ada on the gcc SVN head.  I have
> > done no testing beyond that.
>
> Is there a simulator for arm? Frederic do you have a testing
> environment in mind? What "--enable-rtemsbsp=X" should I use?
Well, I plan to use Skyeye for simulation. The target is an ep9312 from Cirrus
Logic. Even if I didn't manage to compile the edb7312 support, I wanted to read
how it was made to try to port RTEMS on ep9312. I think this should be a good
study for me.
I just had a quick to skyeye and it seems to be based upon armulator which is a
target of RTEMS. So, I guess buiding with the armulator bsp should be a good
beginning.

Fred

Re: Ada on ARM

[Joel Sherrill <joel@OARcorp.com>]

Laurent GUERBY wrote:
> On Mon, 2005-11-21 at 12:15 -0600, Joel Sherrill  wrote:
> 
>>arm-rtems4.7 does build C, C++, and Ada on the gcc SVN head.  I have 
>>done no testing beyond that.
> 
> 
> Is there a simulator for arm? Frederic do you have a testing
> environment in mind? What "--enable-rtemsbsp=X" should I use?

I suppose the GameBoy Advance (gba) BSP is your best bet.  Instructions
for it are on the Wiki but I personally don't have any experience with 
it yet.

There is also the possibility that the SkyEye simulator could be made to 
work with the edp7312 BSP but that hasn't been worked through yet.

> I'm building up to GCC for arm-rtems4.7 right now.

Did you resolve the issue about the target including a version number?

I also have this arm-rtems specific patch.  Something changed after 
4.0.x and none of the RTEMS BSPs would link before I added this.

Index: gcc/config/arm/rtems-elf.h
===================================================================
--- gcc/config/arm/rtems-elf.h  (revision 107316)
+++ gcc/config/arm/rtems-elf.h  (working copy)
@@ -37,3 +37,10 @@
  #undef SUBTARGET_EXTRA_ASM_SPEC
  #define SUBTARGET_EXTRA_ASM_SPEC "\
    %{!mhard-float: %{!msoft-float:-mfpu=softfpa}}"
+
+/*
+ *  The default includes --start-group and --end-group which conflicts
+ *  with how this used to be defined.
+ */
+#undef LINK_GCC_C_SEQUENCE_SPEC
+#define LINK_GCC_C_SEQUENCE_SPEC "%G %L"

Re: Ada on ARM

[Joel Sherrill <joel@OARcorp.com>]

Frédéric PRACA wrote:
> Selon Laurent GUERBY <laurent@guerby.net>:
> 
> 
>>On Mon, 2005-11-21 at 12:15 -0600, Joel Sherrill  wrote:
>>
>>>arm-rtems4.7 does build C, C++, and Ada on the gcc SVN head.  I have
>>>done no testing beyond that.
>>
>>Is there a simulator for arm? Frederic do you have a testing
>>environment in mind? What "--enable-rtemsbsp=X" should I use?
> 
> Well, I plan to use Skyeye for simulation. The target is an ep9312 from Cirrus
> Logic. Even if I didn't manage to compile the edb7312 support, I wanted to read
> how it was made to try to port RTEMS on ep9312. I think this should be a good
> study for me.
> I just had a quick to skyeye and it seems to be based upon armulator which is a
> target of RTEMS. So, I guess buiding with the armulator bsp should be a good
> beginning.

The armulator BSP doesn't quite initialize memory right.  The last I 
knew, the SkyEye simulator did not run the BSP and no one had 
investigated.  That BSP was developed on real hardware.  I would hope 
the edb7312 BSP would be VERY close to working.

--joel

Re: Ada on ARM

[Ralf Corsepius]

On Mon, 2005-11-21 at 13:48 -0600, Joel Sherrill  wrote:

> I also have this arm-rtems specific patch.  Something changed after 
> 4.0.x and none of the RTEMS BSPs would link before I added this.
> 
> Index: gcc/config/arm/rtems-elf.h
> ===================================================================
> --- gcc/config/arm/rtems-elf.h  (revision 107316)
> +++ gcc/config/arm/rtems-elf.h  (working copy)
> @@ -37,3 +37,10 @@
>   #undef SUBTARGET_EXTRA_ASM_SPEC
>   #define SUBTARGET_EXTRA_ASM_SPEC "\
>     %{!mhard-float: %{!msoft-float:-mfpu=softfpa}}"
> +
> +/*
> + *  The default includes --start-group and --end-group which conflicts
> + *  with how this used to be defined.
> + */
> +#undef LINK_GCC_C_SEQUENCE_SPEC
> +#define LINK_GCC_C_SEQUENCE_SPEC "%G %L"

I fail to see what this patch is good for. 

All rtems targets use the default LINK_GCC_C_SEQUENCE_SPEC and I fail to
understand why the arm should be an exception.

I'd suspect bugs in RTEMS bsp_specs hitting you.

Ralf